Apparatus for the manufacture of hollow bricks closed on all sides



A. KAHR.

APPARATUS FOR THE MANUFACTURE OF HOLLOW BRICKS CLOSED ON ALL SIDES.

' APPLICATION HLED MAY 17, 1920.

1,41 1, 1 70, Patented Mar. 28, 1922.

niueosm'xmmor LEIPZIG-LINDENAU; GERMANY; I

nrrmarus'ronmflnlmmvrncronn or noLLow-nmcxs CLOSEDONALL sI-m'zs'. 1

.. ful Improvements 'in Apparatus for theen'gin'e'e'r', a subject'of 'th'e German State, I

and resident of .Leipzig-Lindenau', Ger many, have invented certam-newand use- 1 Manufacture of'Hollo'w Bricks Closed on all Sides, for which application hasbeen filed in Germany June 10, 1913, Switzerland? Decf lO, 1919; Sweden Dec. '10, 1919; Hol- I land Dec.,.13,, 1919.; Norway Dec- 16, 1919;

Denmark'Dec. 17, 1919'; Italy Dec. 27, 19-19;

ence marked tl1ereon,. which form a part of. this specification.

Spain Feb. 10, 1920 Belgium Feb. 24,v 1920 F rance Feb. 26, 1920);; land I do hereby declare thefollowing, to be a..full,'clear, and exact description of the invention, such as 4 will enable others skilled in the artto which it. appertains to make andLusef the. same, reference being had to c the accompanying,

drawings, and to letters or figures of refer- There are.already'brick-presses for the manufacture of hollow bricks closed onall sides. This press has in its mouthspiece; a core that may be turned. This core was hitherto of such shape that it'pushed at its rotation a quantity of clay intothe cavity made by itself and formed in this manner the closing wall.

Besides the brick-press is provided with a contrivance as to avoid the formation of a vacuum. This contrivance usually consisted of a tongue (prickle) whichmade a hole in the front-wall of the brick so that .air could enter the interior of the hollow brick from outside through the formed front-wall.

As to avoiding the vacuum all the brickpresses for the manufacture of hollow bricks;

closed on all sides operate-in the same way, without any difference whether the manufacture 0f the brick ensued by discharging the core from the vertical to the horizontal position or by drawing back the core from the mouth-piece or by damming up the clay mass by means of slide-valves, (bolts). In all these cases it was necessary to make holes in the closing walls of the hollow brick to give access to the air into the interior of the brick.

On account of these holes in the closing walls the bricks made in this Way were only to be used as quarry-stones for sp'andrel,

however the could not be used where a Patented' Malr. 28,1922.

Application filedil iay 17, 1920. Serial No..381-,95'1.

smooth surface was wanted,.e. g;, for fire proof gables or .as brick for'ifacing etc.

According, to the inventionthe brick presses for the manufacture of:hollowybricks-:

closed'on all sides and suppliedwith a-,revolv'lng coreshall. be modifiedlas to make bricks which are. completely" closed at. its. shuttingwalls, that is: to say Without airopenlngs. The process is also applicable touar yt n is used.

The essential features of the invention is especially if less} plastic clay to introduce air from outside into the hollow; spacethat; is made, inthe out-coming..-direction ofthe clay-string'at the'place where the hollow space isformed, i. ,e., d rectly 'atuthecore. For this manner-of a1r-supplythose presses suit best which have a revolving core remaining at its rotation always in the I mouth-piece.

The suppl y of'air is done by air-chambers which .may be placed in the core or theJ latter is divided and'a.spec'ial air-chamber havingan. additional .piece is used, whereby the: chamber is? as narrow as. possible and:

placed between the two parts =of-the core;-

r In order to allow the escapezoffgas; and" steam afterwards during firing, air-holes maybe pricked in the sides of the clay string on the non-facing sides of the tile.

Both methods of supplying air can be combined, and also it is possible to use a vertical shaft instead of a horizontal one, particularly when several cores are arranged one over the other.

In the drawings, in which like parts are similarly designated- Figure 1 is a cross section, and V Fig. 2 is a longitudinal section of one form of mechanism for producing completely closed hollow tile.

Fig. 3 is a cross section, and I Fig. 4 is a longitudinal section of an other form of mechanism. Fig. 5 is a perspective view illustrating one end of the clay string.

Fig. 6 is a longitudinal sect-ion showing i the method of forming the end walls.

Figs. 7 to 11 illustrate the successive and has an exterior recess 0 which brings for I ward the clay-mass for the formation of the closing wall at each rotation. The core is hollow andconsists'of two or several parts d, e, which aresuitably screwed together.

'p r 4 may be taken ofl' in orderto clean the inner parts of the core; One-part of the corerotatesywith the shaft othrough which the air enters.

The air passes out through the hole f directly into the hollow space in the clay string, in advance of the clay forwarded by the depression 0. In Figures 3, 2, 4 the air is lead-through a special tube d into the air-chamber The core consists of twoparts b?! b", situated by the side of the air'chamher; The shaft 0* in this case issolid and passes throughthe air-chamber; The exit of-the air ensueseither through the hole i or 'thro-ugha slitin the air-chamber and in both cases automatically, caused bfy the. arising vacuum. i a

The air, however, maybe pressed in from outside by air-pumps but the pressure is not high, as otherwisethe'sides of the string would bulge. f

'Figure'5 shows the completely closed wall of a brick. Figure 6 is a'working-scheme with the revolving core. The separation of the bricks is madeby cutting the clay-string on'the line 4- 1. In a continuous hollow brick or'tile making machine, the combination with a mouth-piece through which clay is expressed; of a cylindrical rotatable core having a" clay, forwarding recess in its periphery and having means to conduct air to. the

interior of the clay string during the rotation of said core.

2. In a continuous hollow brick. or. tile making machine, the combination with a mouth-piece through which clay is exforwarding recess in its periphery, said core composed of a plurality-of hollow sections,

one of which has one or more discharge orifices for discharging air into the interior ofv the-clay string during the'expression there pressed;.ofa cylindrical core having a clay' 3. In a continuous hollow brick ortile making machine, the combinationwitha mouth-piece through which the clay is expressed; of a cylindrical core composed of one or more hollow members, a hollow shaft for rotating said core, said core havinga,

clay-forwarding depression extending longi tudinally. thereof, and perforations the 7 portion of the core that isnotdepre'ssedfor string. t H t 4-. n a continuousholjlow'. brick or tile making machine, the combination-with fa mouth-piece through-*which the clay is expressed; of a cylindricalirotatable core mem ber having a clay forwarding recess in its periphery consisting oftwo portions,'andja supplying air to the. interior of the hollow.

hollow stationary member between said portions having air exits ,for discharging" air into the interiorof the clay string. .Intestimony that I claim the foregoing as 

